The User Verification plugin had no effect on the spam users. Logged in today with 22 spam user accounts.
I’ve installed Anti-Spam by Cleantalk to see if it does any better.
The plugin I had been using to combat spam user account being created evidently stopped working. I had over 1000 spam accounts created.
Trying a new plugin called User Verification (the free version). Going to see if it works.
What I thought I wanted here ended up being not so much what I wanted.
So I did it again.